diff --git a/src/main_wpt.zig b/src/main_wpt.zig
index a8b3c4d6..161645b1 100644
--- a/src/main_wpt.zig
+++ b/src/main_wpt.zig
@@ -66,6 +66,7 @@ pub fn main() !void {
 
     var app = try App.init(allocator, .{
         .run_mode = .fetch,
+        .user_agent = "User-Agent: Lightpanda/1.0 Lightpanda/WPT",
     });
     defer app.deinit();